Double blind



FIG. 1 is a perspective view of a double blind showing the said Design;

FIG. 2 is a top plan view of the design of FIG. 1

FIG. 3 is a front elevation of the design of FIG. 1;

FIG. 4 is a bottom plan of the design of FIG. 1,

FIG. 5 is a right side elevation of the design of FIG. 1,

FIG. 6 is a rear elevation of the design of FIG. 1; and,

FIG. 7 is a left side elevation of the design of FIG. 1.

The broken lines in the drawings depict the line of the blind slats that are apparent on the face of the blind. 

The ornamental design for a double blind, as shown and described. 